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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Total contract assets | $ 107.9 |  | $ 107.9 |  | $ 86.9
Total advances on contracts | 28.3 |  | 28.3 |  | $ 38.6
Revenue recognized | $ 4.8 | $ 13.3 | $ 25.3 | $ 35.8 |
SBB |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Percentage complete | 90.00% |  | 90.00% |  |
Provisions recognized |  |  |  | 6.1 |
(Decrease) to loss on contracts | $ (0.7) |  | $ (0.5) |  |
Network Rail |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Provisions recognized | $ 11.2 |  | 13.3 |  |
(Decrease) to loss on contracts |  |  | $ 36.8 | (23.5) |
Deutsche Bahn |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Percentage complete | 46.00% |  | 46.00% |  |
Provisions recognized |  | $ 2.4 | $ 7.2 | $ 10.8 |
Contract | Network Rail |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Percentage complete | 63.00% |  | 63.00% |  |
Harsco Environmental Segment |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Remaining performance obligation | $ 73.7 |  | $ 73.7 |  |
Harsco Environmental Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Remaining performance obligation | 21.7 |  | 21.7 |  |
Harsco Environmental Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Remaining performance obligation | 17.7 |  | 17.7 |  |
Harsco Environmental Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01 |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Remaining performance obligation | 14.1 |  | 14.1 |  |
Harsco Environmental Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-10-01 |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Remaining performance obligation | 11.8 |  | 11.8 |  |
Harsco Rail Segment |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Remaining performance obligation | 119.0 |  | 119.0 |  |
Harsco Rail Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Remaining performance obligation | 54.9 |  | 54.9 |  |
Harsco Rail Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Remaining performance obligation | 27.3 |  | 27.3 |  |
Harsco Rail Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01 |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Remaining performance obligation | 21.0 |  | 21.0 |  |
Harsco Rail Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-10-01 |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Remaining performance obligation | $ 6.9 |  | $ 6.9 |  |

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